Hitachi RAS-NP4US Manual

Installation, Operation and Maintenance
INSTRUCTIONS MANUAL
SPLIT-SYSTEM
AIR CONDITIONERS
Models：
：：
：
Cooling Units Condensing Units
RAS-NP4US + RAS-NP4CTS
RAS-NP5US + RAS-NP5CTS
RAS-NP6US + RAS-NP6CTS
RAS-NP8US + RAS-NP8CTS
RAS-NP9US + RAS-NP9CTS
RAS-NP10US + RAS-NP10CTS
RAS-NP13US + RAS-NP13CTS
RAS-NP15US + RAS-NP15CTS
REFRIGERANT:R410A
IMPORTANT:
READ AND UNDERSTAND THIS
INSTRUCTION MANUAL BEFORE
USING THIS AIR CONDITIONER.
KEEP THIS MANUAL FOR FUTURE
REFERENCE.
65MP31
96

IMPORTANT NOTICE
˗HITACHI pursues a policy of continuing improvement in design and performance of products. The
right is therefore reserved to vary specification without notice.
˗HITACHI cannot anticipate every possible circumstance that might involve a potential hazard.
˗No part of this manual may be reproduced without written permission.
˗Signal words (DANGER, WARNING and CAUTION)are used to identify levels of hazard
seriousness. Definitions for identifying hazard levels are provided below with their respective signal
words.
Immediate hazards which WILL result in severe personal injury or
death.
Hazards or unsafe practices which COULD result in severs personal
injury or death.
Hazards or unsafe practices which COULD result in minor personal
injury or product or property damage.
Useful information for this operation and/or maintenance.
˗If you have any questions, contact your contractor or dealer of HITACHI.
˗This manual gives a common description and information for this air conditioner which you operate
as well as for other models.
˗This air conditioner has been designed for the following temperatures. Operate the air conditioner
within this range.
Condenser Air Inlet Temperature and Evaporator Air Inlet Temperature
Model
Condenser Air Inlet Temperature
-
Dry Bulb
-
Evaporator Air Inlet Temperature
-
Dry/Wet Bulb
-
Maximum
Minimum
Maxi
mum
Minimum
All Models 52°C
125°F
20°C
68°F
35°C / 21.5°C
95°F / 70.5°F
19.5°C / 14°C
67°F / 57°F
NOTES:
1. When the unit is operating at a condenser air inlet temperature of 52°C DB (125°F DB), the
maximum evaporator air inlet temperature shall be 18°C WB (64.4°F WB).
2. All models: 80% to 120% of Nominal Air Flow.
Hitachi’s air conditioners are designed and manufactured based on using the specified refrigerants. The applicable
refrigerants are specified to each unit models. However, in the global sites, it is revealed that charging different type
of refrigerants instead of the specified refrigerants. This action may cause mechanical troubles, malfunction and
failure, and in the worst case, it endangers safety seriously and may cause a fire or an explosion.
Therefore, Do Not charge the non-specified refrigerants or others in the refrigerant cycle of the unit as follows:
˗Hydrocarbon Refrigerants such as Propane or etc.
˗Oxygen, Flammable Gases such as Acetylene or etc.
˗Poisonous Gases.
The types of charging refrigerants are indicated in the Installation and Maintenance Manuals, Technical Catalogs,
Service Manuals and the specification label in the each unit. Be aware that Hitachi does not take any
responsibility for unit failure, troubles of malfunction, and any accidents caused by charging the
non-specified refrigerants or others such as above.
DANGER
炰
烉
ˏDANGER
炰
ˏ
WARNING
炰
烉
ˏCAUTION
炰
烉
NOTE
烉

OPERATION INSTRUCTIONS HITACHI Split-System Air Conditioners
For Combined Models: RAS-NP4US+RAS-NP4CTS
RAS-NP5US+RAS-NP5CTS
RAS-NP6US+RAS-NP6CTS
RAS-NP8US+RAS-NP8CTS
RAS-NP9US+RAS-NP9CTS
RAS-NP10US+RAS-NP10CTS
RAS-NP13US+RAS-NP13CTS
RAS-NP15US+RAS-NP15CTS
Starting Procedures
1. Switch ON the main power source to the
unit.
2. Set the operation switch of the room
thermostat to the desired operation position.
FAN-Ventilation Operation
COOL-Cooling Operation
3. Set the thermostat knob of the room
thermostat to the desired temperature.
4. Set the system switch of the room thermostat
to the ON position.
Stopping Procedures
1. Set the operation switch to the OFF position.
2. Switch OFF the main power source to the
unit. Please contact your service shop if the
trouble is still not solved.
Maintenance
1. Clean or replace the filter.
2. Clean the cabinet with cleaner.
3. Clean the condensate drain pan and the drain
piping.
4. Clean the condenser. It is recommended that a
specialist be contacted for this type of work.
5. Check for abnormal sounds and vibration.
Stop the unit and contact your service shop, if
observed.
Troubleshooting
Unit Does Not Start
1. Is the main power source switch to the unit
ON?
2. Is the main fuse normal?
3. Is the phase of main power source right?
Poor Cooling Operation
1. Are there any obstacles, which hamper
sufficient air to the condenser?
2. Check to ensure that the thermostat is set at
the desired position
3. Check the air filter for clogging.
4. Are there any obstacles, which hamper free
air flow to the room thermostat?

IMPORTANT NOTICE
˗HITACHI pursues a policy of continuing improvement in design and performance of products. The
right is therefore reserved to vary specification without notice.
˗HITACHI cannot anticipate every possible circumstance that might involve a potential hazard.
˗No part of this manual may be reproduced without written permission.
˗Signal words (DANGER, WARNING and CAUTION)are used to identify levels of hazard
seriousness. Definitions for identifying hazard levels are provided below with their respective signal
words.
Immediate hazards which WILL result in severe personal injury or
death.
Hazards or unsafe practices which COULD result in severs personal
injury or death.
Hazards or unsafe practices which COULD result in minor personal
injury or product or property damage.
Useful information for this operation and/or maintenance.
˗If you have any questions, contact your contractor or dealer of HITACHI.
˗This manual gives a common description and information for this air conditioner which you operate
as well as for other models.
˗This air conditioner has been designed for the following temperatures. Operate the air conditioner
within this range.
Condenser Air Inlet Temperature and Evaporator Air Inlet Temperature
Model
Condenser Air Inlet Temperature
-
Dry Bulb
-
Evaporator Air Inlet Temperature
-
Dry/Wet Bulb
-
Maximum
Minimum
Maxi
mum
Minimum
All Models 52°C
125°F
20°C
68°F
35°C / 21.5°C
95°F / 70.5°F
19.5°C / 14°C
67°F / 57°F
NOTES:
1. When the unit is operating at a condenser air inlet temperature of 52°C DB (125°F DB), the
maximum evaporator air inlet temperature shall be 18°C WB (64.4°F WB).
2. RUA-NP4ATS,RUA-NP5ATS,RUA-NP9ATS and RUA-NP10ATS: 80% to 120% of Nominal
Air Flow.RUA-NP6ATS and RUA-NP8ATS: 80% to 115% of Nominal Air Flow.
Hitachi’s air conditioners are designed and manufactured based on using the specified refrigerants. The applicable
refrigerants are specified to each unit models. However, in the global sites, it is revealed that charging different type
of refrigerants instead of the specified refrigerants. This action may cause mechanical troubles, malfunction and
failure, and in the worst case, it endangers safety seriously and may cause a fire or an explosion.
Therefore, Do Not charge the non-specified refrigerants or others in the refrigerant cycle of the unit as follows:
˗Hydrocarbon Refrigerants such as Propane or etc.
˗Oxygen, Flammable Gases such as Acetylene or etc.
˗Poisonous Gases.
The types of charging refrigerants are indicated in the Installation and Maintenance Manuals, Technical Catalogs,
Service Manuals and the specification label in the each unit. Be aware that Hitachi does not take any
responsibility for unit failure, troubles of malfunction, and any accidents caused by charging the
non-specified refrigerants or others such as above.
DANGER
炰
烉
ˏDANGER
炰
ˏ
WARNING
炰
烉
ˏCAUTION
炰
烉
NOTE
烉

HITACHI Split-System Air Conditioners Cooling Units
Models: RAS-NP4US through RAS-NP15US
RAS-NP4US and RAS-NP5US
1. Return Air Connection
2. Supply Air Connection
3. Refrigerant Piping Connection
for Liquid Line
4. Refrigerant Piping Connection
for Gas Line
5. Hole for Power Supply
6. Condensate Drain Connection
RAS-NP9US and RAS-NP10US
RAS-NP6US and RAS-NP8US RAS-NP13US and RAS-NP15US

RAS-13NPCTS and RAS-NP15CTS
RAS-NP4CTS and RAS-NP5CTS
HITACHI Split-System Air Conditioners Condensing Units
Models: RAS-NP4CTS through RAS-NP15CTS
RAS-NP6CTS and RAS-NP8CTS
1. Condenser Air Intake
2. Condenser Air Discharge
3. Refrigerant Piping Connection
for Liquid Line
4. Refrigerant Piping Connection
for Gas Line
5. Hole for Power Supply
6. Hole for Control Circuit
7. Service Panel
RAS-NP9CTS and RAS-NP10CTS

1
PREPARATION
Preparation
Initial Check
Required Materials - Measure, Architectural Information, Regarding Installation Location.
Installation Location - Confirm that the final installation location is available for convenient piping,
wiring and ducting work. Strong water runoff should be avoided.
Installation Space - Check for obstacles which restrict air flow or hamper maintenance work in the
space specified in Fig. 1.
Foundation - Make sure the foundation is smooth, horizontal and sufficiently strong, taking into
account the maximum foundation gradient Fig. 2. and the unit weight balance Fig. 3-1 and Fig. 3-2.
Cooling Unit
Confirm elevation provision for the unit on a solid base with an iron frame or concrete curbs in order to
obtain proper clearance beneath the unit or confirm suspension provision for the unit shown in Fig.
4-1.
Condensing Unit
Confirm elevation provision for the unit on a solid base with an iron frame or concrete curbs shown in
Fig. 4-2. in order to obtain proper clearance beneath the unit for either rooftop or on-the-ground
installation. Additionally, for on-the-ground installation, provide a gravel or concrete space around the
condenser air intake, in order to avoid air flow obstruction due to grass or other vegetation.
Unit - Check to ensure that the unit has been transported without damage. File a damage claim with
the transportation companies if mishandling due to transportation company negligence is suspected.
Transportation - secure the route to the final installation location by confirming the packing
dimensions (see “Unit General Data” in Technical CatalogⅠ).

2
Refrigerant Piping
Connection Side
700mm
700mm
INSTALLATION SPACE
Installation Space
Cooling Units Condensing Units
RAS-NP4US through RAS-NP8US RAS-NP4CTS through RAS-NP10CTS
RAS-NP9US through RAS-NP15US RAS-NP13CTS and RAS-NP15CTS
Fig. 1.
Installation Space

3
MAXIMUM FOUNDATION GRADIENT
Maximum Foundation Gradient
Cooling Units
Condensing Units
Fig.2 Maximum Foundation Gradient
Model Dimensions A B
deg. mm deg. mm
RAS-NP4US 0.6 10 0.6 10
RAS-NP5US 0.6 10 0.6 10
RAS-NP6US 0.6 10 0.6 12
RAS-NP8US 0.6 10 0.6 15
RAS-NP9US 0.6 10 0.6 16
RAS-NP10US 0.6 10 0.6 16
RAS-NP13US 0.6 15 0.6 16
RAS-NP15US 0.6 15 0.6 16
Model Dimensions A B
deg. mm deg. mm
RAS-NP4CTS 1.0 14 1.0 17
RAS-NP5CTS 1.0 14 1.0 17
RAS-NP6CTS 1.0 19 1.0 23
RAS-NP8CTS 1.0 19 1.0 23
RAS-NP9CTS 1.0 22 1.0 23
RAS-NP10CTS 1.0 22 1.0 23
Model Dimensions A B
deg. mm deg. mm
RAS-NP13CTS 1.0 38 1.0 21
RAS-NP15CTS 1.0 38 1.0 21

4
WEIGHT BALANCE
Weight Balance
Cooling Units
Model Dimensions (mm) Approximate
Operating
Weight (kg)
A B C D
RAS-NP4US 510 610 970 1,130 90
RAS-NP5US 510 610 970 1,130 95
RAS-NP6US 600 610 1,150 1,130 120
RAS-NP8US 750 610 1,430 1,130 130
RAS-NP9US 800 610 1,530 1,130 145
RAS-NP10US 800 610 1,530 1,130 150
RAS-NP13US 820 830 1,560 1,530 200
RAS-NP15US 820 830 1,560 1,530 210
◎
◎◎
◎：
：：
：Center of Gravity
Fig.3-1 Weight Balance